Design of an Interleaved Parallel LED Driver Based on a Quadratic Buck Converter
CHEN Lianghui
Abstract：To effectively address issues such as low voltage transfer ratio and high output current ripple in traditional LED driver power supplies under high-voltage input conditions,this paper proposes an interleaved parallel LED driver power supply based on a secondary Buck power factor correction(PFC)converter.Building upon the conventional secondary Buck PFC circuit,a switching network consisting of switching transistors,diodes,inductors,and capacitors is added in parallel to form a two-phase interleaved parallel structure.The main circuit topology and interleaved control strategy are detailed.A fixed-phase difference PI control strategy is employed to achieve constant current output.Experimental results demonstrate that this solution achieves a power factor exceeding 0.98,a conversion efficiency of 92.3%,and output current ripple controlled within 3%,effectively improving output current quality.It provides a reliable solution for the design of high-performance LED driver power supplies.
Keywords：LED driver power supplysecondary-type Buck converterinterleaved parallelpower factor correction
Publication Date：2025-11-25
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：3( 67-69 )